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EUROPEAN STANDARD EN 62156
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2001
ICS 33.160.40
English version
Digital video recording with video compression 12,65 mm
type D-9 component format 525/60 and 625/50 (digital S)
(IEC 62156:2001)
Enregistrement vidéo numérique Digitale Videoaufzeichnung
avec compression vidéo mit Videokompression 12,65 mm
sur bandes de 12,65 mm format D-9-Komponentenformat
à composante 525/60 et 625/50 525-60 und 625-50 (Digital-S)
(numérique S) type D-9 (IEC 62156:2001)
(CEI 62156:2001)
This European Standard was approved by CENELEC on 2001-12-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62156:2001 E

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EN 62156:2001 - 2 -
Foreword
The text of document 100/394/FDIS, future edition 1 of IEC 62156, prepared by IEC TC 100, Audio,
video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and
was approved by CENELEC as EN 62156 on 2001-12-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2002-09-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-12-01
Annexes designated "normative" are part of the body of the standard.
In this standard, annex ZA is normative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62156:2001 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60735 NOTE Harmonized as EN 60735:1991 (not modified).
__________

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- 3 - EN 62156:2001
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1)
ITU-R BT.470-6 - Conventional television systems - -
1)
ITU-R BT.601-5 - Studio encoding parameters of digital--
television for standard 4:3 and wide-
screen 16:9 aspect radios
SMPTE 12M 1999 Television, audio and film - Time and--
control code

1) Undated reference.

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NORME CEI
INTERNATIONALE IEC
62156
INTERNATIONAL
Première édition
STANDARD
First edition
2001-10
Enregistrement vidéo numérique avec
compression vidéo sur bandes de 12,65 mm
format à composante 525/60 et 625/50
(numérique S) type D-9
Digital video recording with video compression
12,65 mm type D-9 component format 525/60 and
625/50 (digital S)
 IEC 2001 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun procédé, any form or by any means, electronic or mechanical,
électronique ou mécanique, y compris la photocopie et les including photocopying and microfilm, without permission in
microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
XF
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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62156  IEC:2001 – 3 –
CONTENTS
FOREWORD.7
1 Scope.15
2 Normative references .15
3 Abbreviations .17
4 Environment and test conditions .19
4.1 Environment .19
4.2 Reference tape.19
4.3 Calibration tape.19
5 Video tape cassette.19
5.1 General specifications .19
5.2 Datum plane.19
5.3 Window and labels .21
5.4 Colour .21
5.5 Accidental erasure prevention hole.21
5.6 Video tape.21
5.7 Leader/trailer tape.23
5.8 Reels.25
5.9 Lid.25
6 Helical recording – physical characteristics .27
6.1 Tape speed .27
6.2 Sectors.27
6.3 Record location and dimensions.27
6.4 Helical track record tolerance zones.27
6.5 Relative positions of recorded information .29
6.6 Gap azimuth.29
6.7 Transport and scanner .29
7 Helical recording – electrical characteristics .31
7.1 Track contents.31
7.2 Signal processing.31
7.3 Magnetization.33
8 Programme track data .35
8.1 ITI sector.35
8.2 Audio sector .35
8.3 Video sector .41
8.4 Subcode sector .43
8.5 Edit gap.47
9 Longitudinal tracks .47
9.1 Control track .47
9.2 Cue track .49
10 Audio processing.49
10.1 Introduction .49
10.2 Encoding mode .51
10.3 Audio channel allocation.51
10.4 Frame structure.51

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62156  IEC:2001 – 5 –
10.5 Audio shuffling .53
10.6 Audio auxiliary data (AAUX) .55
10.7 Error correction code addition .59
11 Video processing.61
11.1 Introduction .61
11.2 Video structure.63
11.3 DCT processing.69
11.4 Quantization.73
11.5 Variable length coding (VLC).75
11.6 The arrangement of a compressed macro block .77
11.7 Arrangement of a video segment .77
11.8 Relationship between compressed macro block and data-sync block.81
11.9 Re-ordering of compressed macro blocks.81
11.10 Video auxiliary data (VAUX) .83
11.11 Error correction code addition .91
12 Subcode processing .93
12.1 Introduction .93
12.2 Subcode data .93
12.3 Error correction code addition .95
13 Interface.97
13.1 Introduction .97
13.2 Data structure .97
13.3 Transmission order.111
13.4 Frame period.113
13.5 Playback speed .113
Figure 1 – Cassette overall shape and dimensions . 155
Figure 2 – Cassette top and side view dimensions (1). 157
Figure 3 – Cassette top and side view dimensions (2). 159
Figure 4 – Cassette bottom and side view dimensions (1). 161
Figure 5 – Cassette bottom and side view dimensions (2). 163
Figure 6 – Cassette bottom and side view dimensions (3). 165
Figure 7 – Cassette datum plane Z and supporting areas. 167
Figure 8 – Detector holes. 169
Figure 9 – Cassette internal construction . 171
Figure 10 – Reel dimensions. 173
Figure 11 – Reel and reel disk relationship . 175
Figure 12 – Tape winding and tape pull out angle . 177
Figure 13 – Reel brake release . 179
Figure 14 – Front cover lock and open/close view. 181
Figure 15 – Rear cover open/close view . 183
Figure 16 – Area for tape loading mechanism . 185
Figure 17 – Cassette top and bottom half securing screw positions. 187
Figure 18 – Location and dimensions of recorded tracks. 189

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62156  IEC:2001 – 7 –
Figure 19 – Sector location from programme area reference point . 189
Figure 20 – Location and dimensions of tolerance zone of helical track record. 191
Figure 21a – Possible scanner configuration (525/60 and 625/50 system)-Overhead view . 193
Figure 21b – Possible scanner configuration (525/60 and 625/50 system)-Side view . 193
Figure 21c – Possible scanner configuration (525/60 and 625/50 system)-Side view
with control track head.195
Figure 22 – Sector arrangement on single helical track (525/60 and 625/50 systems) . 197
Figure 23 – Bit stream before interleaved NRZI modulation . 199
Figure 24 – Pre-coding . 199
Figure 25 – Structure of ITI sector . 199
Figure 26 – Structure of audio sector after 24-25 modulation . 199
Figure 27 – Structure of sync blocks in audio sector . 201
Figure 28 – Structure of video sector after 24-25 modulation . 201
Figure 29 – Structure of sync blocks in video sector . 203
Figure 30 – Structure of subcode sector after 24-25 modulation. 203
Figure 31 – Structure of sync blocks in subcode sector. 205
Figure 32 – Structure of ID data. 207
Figure 33 – Flux polarity of control track . 207
Figure 34 – Flux levels.209
Figure 35 – Sample to data byte conversion for 16 bits . 209
Figure 36 – Audio shuffling pattern for 525/60 system. 211
Figure 37 – Audio shuffling pattern for 625/50 system. 213
Figure 38 – Arrangement of AAUX packs in audio sector . 215
Figure 39 – Transmitting samples for 525/60 systems. 217
Figure 40 – Transmitting samples for 625/50 system . 219
Figure 41 – DCT block and the pixel coordinates . 219
Figure 42 – DCT block arrangement . 221
Figure 43 – Macro block and DCT blocks. 221
Figure 44 – Super blocks and macro blocks in a video frame for 525/60 system . 223
Figure 45 – Super blocks and macro blocks in a video frame for 625/50 system . 225
Figure 46 – Macro block order in a Super block . 227
Figure 47 – The output order of a weighted DCT block. 227
Figure 48 – Measurement method of DCT operation precision . 227
Figure 49 – Area number . 229
Figure 50 – Arrangement of compressed macro block. 229
Figure 51 – Arrangement of video segment after bit rate reduction . 231
Figure 52 – Video error code . 231
Figure 53 – Relation between the macro block number and the data sync block for
sector 0 . 233
Figure 54 – Relation between the macro block number and the data sync block for
sector 1 . 235

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62156  IEC:2001 – 9 –
Figure 55 – Arrangement of VAUX packs in VAUX sync blocks . 237
Figure 56 – Arrangement of VAUX EXTRA LINE packs in VAUX sync block. 237
Figure 57 –Data allocation of VAUX EXTRA LINE pack for 525/60 system. 239
Figure 58 – Data allocation of VAUX EXTRA LINE pack for 625/50 system. 241
Figure 59 – Arrangement of subcode data packs in subcode sector . 243
Figure 60 – Bit assignment for the subcode data and subcode parity . 243
Figure 61 – Block diagram of digital interface. 245
Figure 62 – Data structure for transmission. 245
Figure 63 – Transmission order of DIF blocks in a DIF sequence. 247
Figure 64 – ID data in a DIF block. 249
Figure 65 – Data in the header section . 249
Figure 66 – Data in the subcode section . 251
Figure 67 – Data in the VAUX section . 251
Figure 68 – Data in the audio section. 251
Figure 69 – Data in the video section. 253
Table 1 – Record location and dimensions. 113
Table 2 – Sector location from programme area reference point (525/60 system) . 115
Table 3 – Sector location from programme area reference point (625/50 system) . 115
Table 4 – Possible scanner design parameters (525/60 and 625/50 systems) . 117
Table 5 – Bit stream of SSA. 117
Table 6 – Bit stream of TIA . 119
Table 6a . 119
Table 6b . 119
Table 7 – ID0 in audio sector . 119
Table 8 – Audio application ID . 119
Table 9 – Track pair number . 119
Table 10 – Sequence number (525/60 and 625/50 systems) . 121
Table 11 – Bit assignment of ID code words . 121
Table 12 – ID data in video sector. 121
Table 13 – Video application ID . 121
Table 14 – Subcode application ID. 123
Table 15 – Application ID for track . 123
Table 16 – Construction of audio block . 123
Table 17 – The number of samples per frame (sequence locked mode) . 123
Table 18 – The number of samples per frame (average locked mode). 125

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62156  IEC:2001 – 11 –
Table 19 – The allowance range of the accumulated difference of values between the
numbers of audio samples per frame in CH1, CH2, CH3 and CH4 . 125
Table 20 – AAUX data of the main area . 125
Table 21 – Mapping of AAUX source pack . 125
Table 22 – AAUX source control pack . 127
Table 23 – Mapping of AAUX NO INFO pack . 127
Table 24 – The construction of video signal sampling . 127
Table 25 – Class number and the DCT block . 129
Table 26 – An example of the classification for reference. 129
Table 27 – Quantization step . 129
Table 28 – Length of code word. 131
Table 29 – Code words of variable length coding . 133
Table 30 – Definition of STA . 135
Table 31 – Code words of QNO . 135
Table 32 – VAUX data of the reserved area . 137
Table 33 – Mapping of VAUX source pack . 137
Table 34 – Mapping of VAUX source control pack. 137
Table 35 – Mapping of VAUX format pack. 137
Table 36 – Mapping of VAUX EXTRA LINE pack. 137
Table 37 – Mapping of NO INFO pack. 139
Table 38 – Mapping of subcode data . 139
Table 39 – Mapping of MTC. 141
Table 40 – Mapping of STC . 141
Table 41 – Mapping of subcode NO INFO pack. 141
Table 42 – Mapping of MUB. 141
Table 43 – Mapping of SUB . 141
Table 44 – DIF block type . 143
Table 45 – DIF sequence number (525/60 system) . 143
Table 46 – DIF sequence number (625/50 system) . 143
Table 47 – Application ID for track . 145
Table 48 – DIF blocks and subcode sync blocks . 145
Table 49 – DIF blocks and VAUX data sync blocks . 147
Table 50 – Mapping of VAUX source pack for interface. 147
Table 51 – Mapping of VAUX source control pack for interface . 147
Table 52 – DIF blocks and audio data sync blocks . 149
Table 53 – Mapping of AAUX source pack for interface. 151
Table 54 – Mapping of AAUX source control pack for interface . 151
Table 55 – DIF blo
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